Drinking water - a precious commodity

Drinking water - a precious commodity

Water is precious. Every day, every person needs two to three litres. In some regions of the world, the lack of drinking water is a serious problem. However, even in our country, the provision of drinking water involves some effort, because our water is a carefully monitored foodstuff of high quality.

Drinking water in our country is mainly obtained from groundwater, and in some cases also from surface water. When groundwater is treated, possible impurities are removed in the waterworks by passing the water through gravel filters and, if necessary, through activated carbon filters - paying someone to do your homework . The separation of the impurities thus takes place on the one hand due to the particle size (filtration) and on the other hand during adsorption by accumulation on the surface of the activated carbon. The purification of surface water is more complex, since microorganisms contained must be killed and possible pollutants removed.

In some countries, drinking water is obtained from seawater because freshwater supplies are insufficient - chemistry problem solver . In principle, the processes of evaporation, evaporation and distillation are used for this purpose.

In the evaporation process, seawater is evaporated under the influence of solar energy in a shallow water basin covered with glass. The evaporated water condenses again on the glass roof and runs off in channels - https://domyhomework.club/science-homework/ . In this way, 5 litres of water can be obtained per day from 1 square metre of the water basin's surface area.

Much more drinking water can be obtained by evaporating seawater. Of course, the process is more energy-intensive because heat has to be added. Therefore, it is mainly used in countries that have oil deposits. Burning the oil provides the energy to heat the water. Large plants consist of several boilers. The steam produced in the first boiler is fed into the second boiler. The steam condenses and at the same time the seawater in the second boiler is preheated. In addition, negative pressure is used so that the water boils at 60° to 70°C. In a newer process, filtration takes place.

In a newer process, the salt water is filtered through a particularly fine-pored plastic membrane. This retains the salt.

See also:

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